Protistplanktc 



99 



very rare liotli on the west and north coast, and especially (only?) 

 oexjurs in the winter months. According' to Cleve (L. 40, p. 284) 

 widely distiibuted in the teinpci-ate part of the Atlantic. 



5. Biddnlphieæ. 



Riddiilpliia (iitw. 



B. atirita (I 



.) liUÉU. 



Occurs vei-y larely in .lanuary and February, but much more 

 frequently during the period of the diatom inflow, and then oc- 

 casionally in larger quantities. 



Distribution : On the northei'n coasts of the Atlantic and its 

 arms, right up to the arctic regions. (Greenland). Arctic and 

 boreal species, on the west coast of Norway and otf the PaerOes 

 only found in the months of Spring. 



B. mobiliensis Bail. 



Very rare and only singly. 



Distribution : Appears to be a southern form, which is not found 

 all the year round on the coasts of Norway. On the west coast, 

 it is most frequent in February and November. According to Cleve, 

 in large quantities on the coast of the British Isles. 



February 1903 in abundance in the English Channel (L. 18, IV). 



Kncampia groenJaudica Cl. 



(PI. VI, tig. 8). 



Only found twice: Brettesnes, V4 1899, 0—3 m., Ingohavet 

 ■*/4 1890, 0—300 m. 



Distribution: Arctic coa.st: Bafflns Bay, Da\is Strait, Green- 

 land. Also found, single specimens, on the coasts of Bohuslan 

 (Sweden) and Scotland. 



6. Chætocereæ. 

 Detoiinia conferracea (C'l.) Uran. 



Lauderia confer vacea Cl. L. ■2ti, p. 11, pi. II, f. 21. Detonula 

 conferracea Gkan L. 68, p. 113. 



Specimens, which seemed to belong to this species, were seen 

 singly in one of the samples: — Folstad V4 1899, in a surface 

 sample (0—3 m.). 



Distribution: Baftin's Bay. A closely related species, D. 

 ci/stifera Gran 1. c. p. 113, pi. 9, f. 15—20, has been found in the 

 Lim Fiord in Denmark, in the Avinter. 



Bactei-osira Gran. 

 L. 68, p. 114. 



B. fragilis (Gran) Gran 1. c. 



Laiuleria fragilis Gran L. 65, p. 115, pi. 1, f. 12 — 14. 



Occurs only during the inflow of diatoms in the spring months. 

 Very frequent from the beginning of April, often in great quantities. 



Distribution: Does not occur on the west coast of Norway. 

 Decidedly arctic species. Found earlier by Gran on the coast of 

 Nordland and Finmark (April 1901.) Also known from Greenland, 

 the sea west of Novaja Semlja (S/S Heimdal, May 1900, cfr. 



Gban L. 70, p. 170), several places on the north and west coasts 

 of Iceland and Greenland (May and June 1898, cfr. Cleve L. 40, 

 p. 331) and right up to Spitzbergen and the sea between Spitz- 

 bergen and Iceland (May and July 1899; cfr. Cl. 1. c.) 



I>it.vliiini Ilriglitwclli (West.) Grin. 



Rare and scarce. 



Distribution: According to Cleve (L. 40, p. 325) very fre- 

 quent in the English Channel, the North Sea and Skagerack, only 

 scarce in the Atlantic. Can hardly be considered as native on the 

 west coast of Norway, but is found here in small numbers in most 

 months of the year. Numerous in February 1903 (scarce in May 

 of the same year, L. 18, IV). Probably comes to us from the more 

 southern coasts. 



Rhixofsoleniu Eiirb. 

 R. alata Briohtw. 



Very rare and only scarce. 



Distribution: Widely distributed in the southern and northern 

 temperate districts of the Atlantic. (Cf. Cleve L. 40, p. 337). 

 In the English Channel occasionally frequent in February 1903 

 (L. 18, IV). Hardly to be considered native on the west coast of 

 Norway, but found in small numbers m nearly all the months of 

 the year. Comes to us as a southern oceanic form. Also known 

 from Mediterranean, the Indian and the Pacific Ocean. 



R. stylitormis Briohtw. 



Only once found: — Skroven 72 1899, in a deep water sample, 

 scarce. 



Distribution: Widely distributed from the wanner districts of 

 the Atlantic right up to Greenland and Spitzbergen. On the west 

 coast of Norway most frequent in the summer months. The same 

 at the Faeroe Islands. Comes to us as a southern oceanic form. 

 Also known from the Mediterranean, the Indian Ocean and the 

 Pacific Ocean. 



R. ShrubsoU Cj 



1899 Malangen 



Only found scarce in two samples: — 

 0—100 m., and -'/s 1900 Bålstad, 0—50 m. 



Distribution: Distributed over the temperate European coasts 

 of the Atlantic. Occurs on the west coast of Norway and at the 

 Faeroe Islands all the year round, most frequent in the summer 

 months. According to Gran (L. 70, p. 173) at Ona (Romsdalen), 

 occasionally, from May to October. It would thus appear to be 

 stationary on the west coast of Norway, but not on the north coast. 

 Quite exceptionally found northwards right up to Greenland. Also 

 known from the Mediterranean, the Indian Ocean and Japan (cf. 

 Cleve L. 40, p. 348). 



R. semispina Hens. 



Very rare and only singly. 



Distribution: Occurs as an oceanic form in large numbers in 

 the arctic waters and in the boundaries of the arctic and Atlantic 

 waters. Not frequent on the coast of the Faeroe Isles, nor on the 

 west coast of Norway, where it is, nevertheless, found in most 



